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A 10-mm diameter tube has a maintained surface temperature of 180°C. Engine oil enters the tube...
Problem 3 has properties of engine oil: d = 248.7x104 (N.s)/m², p=845.7 kg/m",k=0.1379 W/m-K, Pr= 390.2,...
Problem 3 has properties of engine oil: d = 248.7x104 (N.s)/m², p=845.7 kg/m",k=0.1379 W/m-K, Pr= 390.2, p=2163 J/kg-K. Write them down to your scratch paper before starting self-test. A 10-mm diameter tube has a maintained surface temperature of 180°C. Engine oil enters the tube at 70°C at a flow rate of 1.3 kg/s and exits at 105°C. Find the length, in m, of the tube and well as the corresponding heat transfer rate, in W. Assume fully developed flow and...
Engine oil is heated by flowing through a circular tube of diameter D = 50 mm...
Engine oil is heated by flowing through a circular tube of diameter D = 50 mm and length L = 25 m and whose surface is maintained at 150 oC. The flow rate and inlet temperature of the oil are 0.5 kg/s and 20 oC. a. Estimate the outlet temperature Tm,o. B. Average Nusselt number C. Estimate the total heat transfer rate q for the tube.
An oil preheater consists of a single tube of 30-mm diameter and 7-m length, with its...
An oil preheater consists of a single tube of 30-mm diameter and 7-m length, with its surface maintained at 200°C by swirling combustion gasses. The engine oil enters at 90°C and comes out at 144°C. Assume the flow is laminar and both hydraulically and thermally fully developed. Answer the following questions: (a) What flow rate must be supplied to maintain the oil outlet temperature of 144°C? (b) What is the corresponding heat transfer rate? (c) Discuss how you may refine...
(40 points) Engine oil flows at a rate of 1 kg/s through a 5-mm diameter smooth straight tube. Th...
(40 points) Engine oil flows at a rate of 1 kg/s through a 5-mm diameter smooth straight tube. The oil has an inlet temperature of 47°C and it is desired to heat the oil to a mean temperature of 87°C at the exit of the tube. The surface of the tube is maintained at 150°C. Assuming the flow is fully developed both hydrodynamically and thermally, determine the required length of the tube. Note: by calculating Reynolds number at the entrance...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm diameter, 1.75 m tube with a mass flow rate of 6 x 10-4 kg/s. A constant heat flux warms the air so that its exit mean temperature is Tm, 0 = 50°C. Find the required heat flux and wall surface temperature at the outlet. Assume fully developed flow. Step 1 What is the heat rate transfer to the air from the tube, in W?...
Fluid enters a tube with a flow rate of 0.023 kg/s and an inlet temperature of...
Fluid enters a tube with a flow rate of 0.023 kg/s and an inlet temperature of 20°C. The tube, which has a length of 6 mand diameter of 15 mm, has a surface temperature of 30°C. Determine the heat transfer rate to the fluid if it is water, in W. Evaluate the properties of water at 300 K. Obtain the Nusselt number using the Baehr and Stephan recommended correlation. 9 w nin
8.12 Dry, compressed air at Tm,i 75°C, p- 1o atm, with a mass flow rate of a 30-mm-diameter, 5-m-...
part b only please8.12 Dry, compressed air at Tm,i 75°C, p- 1o atm, with a mass flow rate of a 30-mm-diameter, 5-m-long tube whose surface is at T, 25°C. 0.001 kg/s, enters (a) Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. For these conditions the fully developed heat transfer coefficient is...
A can of engine oil with a length of 155 mm and a diameter of 100...
A can of engine oil with a length of 155 mm and a diameter of 100 mm is placed vertically in the trunk of a car. In a hot summer day, the temperature in the trunk is 43°C. If the surface temperature of the can is 17°C, determine heat transfer rate from the can surface. Neglect the heat transfer from the ends of the can and radiation heat transfer. Given: The properties of air at film temperature of 30°C. k...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a temperature of 85 C. On the outside, coolant flows across the tube at a velocity of 3 m/s at a temperature of 25 C. Neglecting the thermal resistance of the metal wall, calculate 1. (a) The two heat transfer coefficients, (b) Overall heat transfer coefficient, and (c) Cooling rate (in W/m) achieved in the given configuration Assume hot fluid properties are constant at the...
Problem 8.023 Fluid enters a tube with a flow rate of 0.017 kg/s and an inlet...
Problem 8.023 Fluid enters a tube with a flow rate of 0.017 kg/s and an inlet temperature of 20°C. The tube, which has a length of 6 m and diameter of 15 mm, has a surface temperature of 30°C. Determine the heat transfer rate to the fluid if it is water, in W. Evaluate the properties of water at 300 K. Obtain the Nusselt number using the Baehr and Stephan recommended correlation 9 Physical Properties Mathematical Functions the tolerance is...
Problem 3 has properties of engine oil: d = 248.7x104 (N.s)/m², p=845.7 kg/m",k=0.1379 W/m-K, Pr= 390.2, p=2163 J/kg-K. Write them down to your scratch paper before starting self-test. A 10-mm diameter tube has a maintained surface temperature of 180°C. Engine oil enters the tube at 70°C at a flow rate of 1.3 kg/s and exits at 105°C. Find the length, in m, of the tube and well as the corresponding heat transfer rate, in W. Assume fully developed flow and...
An oil preheater consists of a single tube of 30-mm diameter and 7-m length, with its surface maintained at 200°C by swirling combustion gasses. The engine oil enters at 90°C and comes out at 144°C. Assume the flow is laminar and both hydraulically and thermally fully developed. Answer the following questions: (a) What flow rate must be supplied to maintain the oil outlet temperature of 144°C? (b) What is the corresponding heat transfer rate? (c) Discuss how you may refine...
(40 points) Engine oil flows at a rate of 1 kg/s through a 5-mm diameter smooth straight tube. The oil has an inlet temperature of 47°C and it is desired to heat the oil to a mean temperature of 87°C at the exit of the tube. The surface of the tube is maintained at 150°C. Assuming the flow is fully developed both hydrodynamically and thermally, determine the required length of the tube. Note: by calculating Reynolds number at the entrance...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm diameter, 1.75 m tube with a mass flow rate of 6 x 10-4 kg/s. A constant heat flux warms the air so that its exit mean temperature is Tm, 0 = 50°C. Find the required heat flux and wall surface temperature at the outlet. Assume fully developed flow. Step 1 What is the heat rate transfer to the air from the tube, in W?...
Fluid enters a tube with a flow rate of 0.023 kg/s and an inlet temperature of 20°C. The tube, which has a length of 6 mand diameter of 15 mm, has a surface temperature of 30°C. Determine the heat transfer rate to the fluid if it is water, in W. Evaluate the properties of water at 300 K. Obtain the Nusselt number using the Baehr and Stephan recommended correlation. 9 w nin
part b only please8.12 Dry, compressed air at Tm,i 75°C, p- 1o atm, with a mass flow rate of a 30-mm-diameter, 5-m-long tube whose surface is at T, 25°C. 0.001 kg/s, enters (a) Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. For these conditions the fully developed heat transfer coefficient is...
A hot fluid passes through a thin-walled tube of 10-mm diameter at 18 kg/h at a temperature of 85 C. On the outside, coolant flows across the tube at a velocity of 3 m/s at a temperature of 25 C. Neglecting the thermal resistance of the metal wall, calculate 1. (a) The two heat transfer coefficients, (b) Overall heat transfer coefficient, and (c) Cooling rate (in W/m) achieved in the given configuration Assume hot fluid properties are constant at the...
Problem 8.023 Fluid enters a tube with a flow rate of 0.017 kg/s and an inlet temperature of 20°C. The tube, which has a length of 6 m and diameter of 15 mm, has a surface temperature of 30°C. Determine the heat transfer rate to the fluid if it is water, in W. Evaluate the properties of water at 300 K. Obtain the Nusselt number using the Baehr and Stephan recommended correlation 9 Physical Properties Mathematical Functions the tolerance is...
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